This report provides national State- and Territory-level statistics on alcohol and other drug treatment services; the clients who use these services; and the type of drug problems for which treament is being sought. It is the first report in what will be a series of annual publications on the Alcohol and Other Drug Treament Services National Minimum Data Set (AODTS-NMDS). This first report predominantly provides information about the clients who access these treatment services – in future collection years there will be a greater emphasis on reporting information about the treatment services.